Disclaimer: Do this at your own risk. I do not accept anything that goes wrong if you mess up! The developers of the game do not allow mods or anything like this. So if you harm the game and/or get banned for some odd reason it is not my fault! YOU HAVE BEEN WARNED. This stuff is highly unlikely!
This video will show you how to mod your saved file of Game Dev Tycoon that was installed via Steam. Follow the steps exactly and you should not have a problem.
What you need to does this.
1) Game installed via steam!
2)Tincta Application from app store. They have a free version. Link below: https://itunes.apple.com/us/app/tincta/id448340648?mt=12
3) Hidden folders on your Mac shown. Terminal command below: Copy and paste defaults write com.apple.Finder AppleShowAllFiles TRUE Reverse: defaults write com.apple.Finder AppleShowAllFiles FALSE